Final Countdown

The second-to-last episode of ER airs tonight on NBC.  I've watched it off and on over the past 15 years, and it's hard to believe the show is finally coming to an end.  The quality has certainly faded, but I've really enjoyed the cameos by many of the old characters over the past few episodes.  After it ends, where will I turn to see doctors using the old-style paddles to shock asystole while screaming "Clear"?